2143111121 has 2 divisors, whose sum is σ = 2143111122. Its totient is φ = 2143111120.

The previous prime is 2143111093. The next prime is 2143111129. The reversal of 2143111121 is 1211113412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1979271121 + 163840000 = 44489^2 + 12800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143111121 - 2¹⁰ = 2143110097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2143111121.

It is not a weakly prime, because it can be changed into another prime (2143111129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071555560 + 1071555561.

It is an arithmetic number, because the mean of its divisors is an integer number (1071555561).

Almost surely, 2^2143111121 is an apocalyptic number.

It is an amenable number.

2143111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143111121 is an equidigital number, since it uses as much as digits as its factorization.

2143111121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 2143111121 is about 46293.7481848251. The cubic root of 2143111121 is about 1289.2829219821.

Adding to 2143111121 its reverse (1211113412), we get a palindrome (3354224533).

The spelling of 2143111121 in words is "two billion, one hundred forty-three million, one hundred eleven thousand, one hundred twenty-one".